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[SVN r20159]
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Jeremy Siek
2003-09-22 16:32:56 +00:00
parent d85b8db0aa
commit ac0c6461fb
2 changed files with 20 additions and 19 deletions
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doc/new-iter-concepts.html
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@ -300,15 +300,16 @@ lvalue so that the appropriate old category can be chosen for the base
class. The <tt class="literal"><span class="pre">lvalue_iterator</span></tt> bit is not recorded in the
<tt class="literal"><span class="pre">iterator_tag::access</span></tt> data member.</p>
<p>The <tt class="literal"><span class="pre">iterator_tag</span></tt> class template is derived from the appropriate
iterator tag or tags from the old requirements based on the new-style
tags passed as template parameters. The algorithm for determining the
old tag or tags from the new tags picks the least-refined old concepts
that include all of the requirements of the access and traversal
concepts (that is, the closest fit), if any such category exists. For
example, the category tag for a Readable Single Pass Iterator will
always be derived from <tt class="literal"><span class="pre">input_iterator_tag</span></tt>, while the category tag
for a Single Pass Iterator that is both Readable and Writable will be
derived from both <tt class="literal"><span class="pre">input_iterator_tag</span></tt> and <tt class="literal"><span class="pre">output_iterator_tag</span></tt>.</p>
iterator tag or tags from the old requirements based on the access
bits and traversal tag passed as template parameters. The algorithm
for determining the old tag or tags picks the least-refined old
concepts that include all of the requirements of the access and
traversal concepts (that is, the closest fit), if any such category
exists. For example, the category tag for a Readable Single Pass
Iterator will always be derived from <tt class="literal"><span class="pre">input_iterator_tag</span></tt>, while the
category tag for a Single Pass Iterator that is both Readable and
Writable will be derived from both <tt class="literal"><span class="pre">input_iterator_tag</span></tt> and
<tt class="literal"><span class="pre">output_iterator_tag</span></tt>.</p>
<p>We also provide several helper classes that make it convenient to
obtain the access and traversal characteristics of an iterator. These
helper classes work both for iterators whose <tt class="literal"><span class="pre">iterator_category</span></tt> is